Motor operated selective control for accurate displacement



Aug. 17, 1954 F. c. MATHIEU MOTOR OPERATED SELECTIVE CONTROL FORACCURATE DISPLACEMENT 3 Sheets-Sheet 1 Filed May 24, 1951 Aug. 17, 1954F. c. MATHIEU 2,586,894

MOTOR OPERATED SELECTIVE CONTROL FOR ACCURATE DISPLACEMENT 3Sheets-Sheet 2 Filed May 24, 1951 Aug. 17, 1954 F. c. MATHIEU MOTOROPERATED SELECTIVE CONTROL FOR ACCURATE DISPLACEMENT 3 Sheets-Sheet 3Filed May 24, 1951 INVEHTOR, FREDERIC. CESAR MATH/5v 5Y Patented Aug.17, 1954 MOTOR OPERATED FOR ACCURATE Frdric Csar Mathieu,

to Compagnie Radio 0 France ELECTIVE CONTROL DISPLACEMENT Paris, France,assignor inema, a corporation of Application May 24, 1951, Serial No.228,102 Claims priority, application France May 25, 1950 14 Claims. 1

In some apparatus or machines, it may be necessary to cause thedisplacement of a movable element which may, for example, be fitted on asliding bar, and which must stop at some exactly determined position,and start the action of other elements at each of these stopping points.Moreover it may be necessary that this control be selective. Forexample, the action produced should be more or less intense in thevarious stopping points, or still more it should be performed bydifferent elements.

Such devices are used in spectrographs intended to successively analysecertain lines chosen in a spectrum. A movable element carrying aphotoelectric cell and provided with an exploring slot has to move alongthat spectrum, the cell being connected to the input of an amplifierwhose output is connected to a measuring apparatus. The movable elementstops at certain precise positions so that the slot, which may be quitenarrow, permits only the radiations of the determined line whoseintenstiy is to be measured, pass and go towards the cell.

Moreover, assuming that the various lines present great differences ofintensity from one to another, a device should then be provided whichcauses a variation of the amplifier sensitivity so as to adapt it for abroad range of measurements to be effected, that is, according to thestopping position of the movable element.

In the known apparatus, the successive stopping points are generallydetermined by the driving control itself, e. g., in relation with therotation angle of a threaded rod, or of a pinion, which meshes with arack. In such arrangements the control depends upon the accuracy withwhich the threads or the cogs of the gears have been cut; and besides,such mechanical links are susceptible to play which is diificult toavoid. It is apparent that it is impossible with such devices to obtainthe accuracy necessary for the utilisation of spectrographs,particularly if it is proposed to effect a series of measures for theanalysis of ores, specimens of alloys, and other similar materials.

The object of the present invention is to eliminate these drawbacks.

According to a first characteristic of the invention, a movable elementsuch as a carriage cooperates with first and second scale rules whichare movable and parallel to its way; means for interlocking said movableelement with said scale rules so as to carry them jointly; a sensitivityselector device being controlled by the position of the saidinterlocking means with regard to the first scale rule, whilst thedisplacement of the second scale rule acts upon a control device in endof course.

According to another characteristic of the invention, the interlockingmeans are constituted by two lugs which may respectively penetrate intonotches provided in the first and the second scale rules, the depth ofpenetration into the notches of the first scale rule determining theposition of the selecting device.

According to a further characteristic of the invention, the controllingdevice is actuated by the second scale rule in an extreme positionthereof and is preferably constituted of an electric contact acting upona vacuum tube electrode.

According to a further characteristic of the invention, the sensitivityselector device is con stituted by a rotatable electro-conductive armwhich comes into contact with one of a plurality of contact studs, saidcontact studs through the connections thereof controlling the inputlevel to an amplifying circuit or any other convenient electricalcontrol circuit.

According to yet another characteristic of the invention, the movableelement is preferably driven by a mechanism involving two speeds, thesecond speed being greatly reduced with respect to the first one, andmeans being provided to pass from the first to the second speed when theinterlocking means are in gear with the first scale rule.

The invention itself, however, both as to its construction and itsmethod of operation, together with additional objects and advantagesthereof, will be best understood from the following description ofspecific embodiments when read in connection with the accompanyingdrawin which:

Figure 1 shows the ensemble of the device in perspective, during thecourse of the carriage;

Figure 2 shows the same device when the carriage is at a stopping pointand Figure 3 illustrates schematically the basic electric connections ofan embodiment of the invention.

In these figures, the same reference numerals indicate the samestructural elements.

Referring first to Figure 1, I indicates a carriage which may slide ontwo rods 2, its drive being effected by means of a threaded rod 3 whichis rotated by means of worm gear 4 driven by a driving unit whichincludes a motor and a convenient gear box shown symbolically in Fig. 3by the block 6|.

The carriage l carries a photoelectric cell of suitable type situatedbehind a narrow slot perpendicular to the run way, that is,perpendicular to the direction of the rods 2 and the screw 3. .#noptical arrangement produces a. spectrum of lines parallel to the samedirection so that when the carriage is moved the slot explores thespectrum. The photoelectric cell is associated with indicating apparatusincluding an amplifier and suitable measuring apparatus and isdiagrammatically illustrated in Fig. 3 by the block 64.

The carriage is moved to successive exact positions so that the slotadmits the radiations of some definite lines, the intensity of which itis proposed to measure. The radiations of the lines then pass towardsthe cell.

Still referring to Figure l, a bushing 5 is provided with two lugs 6 andl and is arranged between two bearings 8 and Q which form part of thecarriage i. A helicoidal spring it tends to turn the bushing in thedirection indicated by the arrow ii.

Reference numerals i2 and i3 designate two rules which will respectivelybe called hereinafter as analysis rule feeler rule. In the analysisrule, a certain number of notches such as 3'? are cut in which cleats ofdifferent heights such as 3 S5 and 36 may be inserted. Notches such as:33 are cut in the feeler rule. During the displacement of the carriage,the spring l tends to turn the bushing which moves the lug 6 so that itcontacts the analysis rule l2.

he bushing is provided with a square bore along its axis to permit thebushing to slide freely on the square sectioned shaft 53, which itselfrotates in the end flanges 45 and 4!, so that this shaft follows theangular motions of the bushing. In addition, the shaft can movelongitudinally in the direction of the arrow 42, by the action of aconvenient device such as an electromagnet with plunger core l4, and isnormally brought back, in reverse direction of that arrow, by the is,The analysis rule 22 can also slide udinally in the end lugs 43 and M;it is pulled back towards l3 by a spring ll, the thrust being adjustableby means of ascrew it.

he fee er rule it may also be displaced lonl,. The feeler rule isprovided with end pegs ending in the flanges and 4!. The feeler rule ispulled back toward the flange 43 by a sprng to cont-act the end of anadjustable screw One of the pegs is prolonged by a rod 2 h passesthrough the flange :l! to push a flexible blade 22 ofelectro--conductive material into electric contact with the end of anadjustable screw 23.

An arm 2 is fixed to the shaft 13 and bears upon a flexible conductingblade 25. So long as '3 bears upon the analysis rule l2, the makescontact with another blade 28. if the lug 6 falls into a notch such as3'l, tation of the bushing 5 in the direction of t a "row ii causes thesquare sectioned shaft 13 t 111, in which case, the arm 24 ceases tobear blade which then comes into contact with .xible blade 2i. It istherefore seen that when the lug is sliding on the rule 12 or has falleninto a notch such as 31, an electric contact =.e either between 25 and25, or between 25 and respectively.

A plunging core magnet 28 is joined to the sha" by means of a smallconnecting-rod =13 hooked to a crank stud When the magnet is ene'gizethis mechanism produces a torque which causes the shaft l2 to turn, aswell as the bushing in a direction inverse to that of arrow 1 I so thatthe lug 6, after falling into a notch, can be removed therefrom.

At the end of the shaft I3 is fixed a selecting arm the extremity ofwhich is arranged, in front of contact studs such 30, 3| and 22, whichof course, may be in any number whatever. When the lug 6 falls into anotch such as 31, the cleat 33 which has been placed in the notchdetermines the end of the angular motion of the bushing 5. Therefore thechoice of cleat 33 determines the contact stud before which the arm willstop. When the latter assumes a predetermined position, and if themagnet M is energized, the shaft i3 is pushed in the direction of thearrow 42, so that the end of the arm 29 con es into contact with thechosen stud.

The operation of this device is as follows:

The optical arrangement, not shown, produces a spectrum of lines. If ithas been decided to measure the intensity of some of the lines, four forexample, the analysis rule I?! would be provided 1th four notches 31, asshown in the figures. The driving mechanism is then made operativewhereupon the carriage i moves in the direction of the arrow 39. The lug5 is caused to slide on. the rule l2 until it meets a notch Sl, intowhich it falls, and comes to rest on the bottom of the cleat The lug 1penetrates at the same time into the corresponding notch 32 of thefeeler rule 13. The arm 24 is caused to turn backwards thereby breakingthe electrical contact between blade 25 and blade 28, the blade 25making contact instead with blade 21. The changing from one contact tothe other, as noted, acts on the driving mechanism 8% to reduce itsspeed so that the carriage l proceeds along its path very slowly anddrives the rules l2 and i8 which results in the compression of thesprings l? and 20 respectively. As a result, the rod El bears upon theblade 22 which makes contact with the end of the screw 23. Thiselectrical contact, acting upon convenient circuits including a controlrelay 52, stops instantaneously the carriage This abrupt stopping of thecarriage is made possible by the reduction of its speed effected as setforth above. At the same time the magnet is is energized, for instanceby a timing mechanism 63, and pushes the shaft I3 back in direction ofthe arrow which results in the compression of the spring the resultbeing that the end of arm comes into contact with a contact plug, 32 forexample. The whole device is then in the resting position shown inFigure 2. The various controls which have just been enumerated can beeasily embodied by means of electromagnetic relays as is well known inthe art.

The contact studs such as 3i and 32 are intended to adapt the amplifiersensitivity of the indi at a apparatus 64 to the intensity of the Thegain is increased 1"- the SUCCGSSf-VG lines. lines of poor brillancy andreduced for lines of great brillancy. For that purpose, any of numerousways for effecting changes in sensitivity may be used. For example,these contact studs may be connected to various taps on an inputresistor of an amplifying stage, or to various taps on a transformerprimary. It would also be possible to replace these contacts studs oy aresistor of circular shape, the end of the conducting arm 29 bearingupon different points according to the angular motions which are trans--ferred to it by the rotation of the bushing 5. The arm 29 could alsobear upon trigger mechanisms.

When the various elements are in the positions represented in Figure 2,the whole device remains stationary for a certain time, which may bedetermined for example by a timing mechanism 63, or any other similardevice. During the stationary time of the device, the photoelectric cellcarried by the carriage is impressed by the radiation from the spectrumline corresponding to the notch 3'3 into which the lug 6 has fallen. Themeasuring apparatus, included in the indicating apparatus 64, may berecording apparatus capable of producing a trace which deviatesproportionally to the flow of light received by the cell. When themeasurement is made, the timing mechanism 63 switches oif the energizingcircuit of the magnet I4 after which it energizes magnet 28. The squaresectioned shaft [3, no longer being pushed back by the magnet I4, isforced back to its initial position by the spring I5 in which case thearm 29 ceases to bear upon the contact stud 32. The shaft I3 is thenrotated by the small connecting rod 43 in a direction inverse to thatillustrated by the arrow I I. At the same time, the rotation of shaft I3causes the rotation of the bushing 5, whereupon the two lugs 6 and ldisengage from their respective rules I2 and I8 which are caused to movebackwards by the action of their antagonistic springs II and 20,respectively. The contact between the flexible blade 22 and the end ofthe screw 23 is then broken. The control relay 62 of the stopping magnetis deenergized, and starts again the driving mechanism 6| of thecarriage at great speed when the contact between the contact springs 25and 26 is made by the arm 24. The timing mechanism 63 also released bythe relay 62 switches off the energizing circuit of the electromagnet 28with the result that the lug S bears again upon the analysis rule I2,while the carriage moves at great speed in the direction of the arrow 39until the lug 6 meets a notch 31. The various controls described aboveare then re" peated.

It will be noticed that the stopping point of the carriage I does notdepend in any way either upon the screw 3 or upon any other part of thedriving mechanism. The stopping point depends upon the distance ABbetween the concerned notch of the rule I8 and the contact point betweenthe contact spring 22 and the end of the screw 23. In order to avoid anysparking at that contact point it is designed to act upon the grid of avacuum tube whose anodic current feeds a relay as above explained.

The rule l8 can be constructed according to known technics in order toeliminate the errors due to temperature variations. It may beconstituted by two parts placed in juxtaposition and made of differentmetals so that the possible expansions of the base 46 will becompensated.

The feeling rule I8 is provided with notches 38 equal in number to thestopping points of the carriage I, while the rule I2 is only providedwith the number of notches 3! necessary for a given series of analysis.The rule I2, illustrated in the figures, is cut with four notches underthe supposition that the intensity of four determined lines of aspectrum is to be measured. However, the notches 3B which do notcorrespond to these four notches 3". will not be availed of in thecourse of the intended analysis.

It will also be noticed that the only object of the rule I2 is to permitthe lug I to penetrate some of the notches 38. For this reason the rule[2 can be constructed with less accuracy than the rule l8. To avoidunnecessary efiort on the part of the operator, the unit may alsoinclude a device for automatically carrying the carriage back to itsstarting position when the exploration of the spectrum is finished. Inthe figures, il designates a rod which may slide in the flanges M2 and4! and carries members 48 and 49 whose positions are adjustable. Thecarriage I is provided with a convenient projection 56, which dependingupon the direction of travel of the carriage, contacts and pushes one orthe other of members 48, 49. When carriage arrives at the end of itstravel, in direction of the arrow 39, the rod :il' bears upon theelectro-conductive elastic blades 5! and 52 joined together andassociated with two other identical blades and 53 respectively. Thecontact is then broken between Ed and 54 and made between 52 and 53. Bythe action of relay 65, the driving mechanism 5i stops and starts againin inverse direction. At the same time, the plunging core magnet 28 isenergized, whereby the lug 6 remains raised during the return travel ofthe carriage I, and so, cannot strike notches of the rule I2. Thecarriage on its way back to its departure point causes projection 56 topush the member 48, whereupon the rod t! breaks the contact between thetwo conducting contact springs 55 and 55, which causes the drivingmechanism to stop. The whole unit then remains stationary until the nextcycle of operation which can be started by the operator by operating aconvenient switch which causes the carriage to move once again in thedirection of the arrow 39.

In the above description, it was assumed that the unit, according to theinvention, was applied to a spectograph, and that the carriage I carrieda photoelectric cell provided with an exploring slot. However, it isevident that the same device could be applied to other purposes. Thecontrols in relation to lengths such as AB being designed with theutmost accuracy and the relay, controlled by the contact between thecontact spring 22 and the screw 23, might for example act upon theelements of a machine tool or upon any control transmitter whatever, andgenerally speaking, upon any device which is to respond to an action inrelation to which accurate and previously chosen displacements aredesired.

The arrangement, represented on the figures, operates by means ofcontacts controlling relays and electric circuits. It is evident that,as the invention concerns a. mechanical combination, it would bepossible to use other means as well. The various elastic contact springsrepresented might be replaced, for example, by slide valve gearsdistributing a fluid under pressure, this fluid carrying out the samecontrols as above mentioned. The magnets I4 and 28 could also bereplaced by cylinders in which a piston is subjected to the pressure ofthat fluid. The arms 29, instead of bearing upon conducting studs, couldin turn act upon distribution valves or upon any trigger mechanismwhatever.

Finally, the invention may also be applied to displacements differentfrom rectilinear displacements. It can, indeed, be understood that itwould be possible, for example, to give a certain curvature to the wholedevice represented in the figures. Instead of being rectilinear, therules I2 and It could be shaped in the form of arcs. In this case thecarriage would move along a path parallel to these arcs. It would alsosufiice to replace the square sectioned shaft I3 by an equivalentsection having a certain flexibility.

What I claim is:

1. In an arrangement including a member movable along a predeterminedpath and a driving me'hanisni 1' moving said movable member along saidprede 'ned path, means for termin ting novem or" said movable member ata predetermined point of said path comprising,

mg member when the same 'ive position thereof and in u'i'fitQCl,stopping said driving path thereof; means speed of movement of saiddriven by said driving mechting means mounted 11 said i oer did movablebetween an oper- Pct-iiating said means for slowing tive position out ofengagefor slowing down the speed movable member; and secr 15 on saidoperating member by said first actuatore said movable member ern edpoint of said path mitting said first aot-uat s more ole down movementof said resulting also in movemember from inoperative in which latterposition ing means stopping the ior moving the movable meming the sloweddown movee mezr of said ope i 1 moving said movable member aioi a saidredete Lined path, m ans for term g llldlolildi'lt of movable member ata p edeterm ned point or" said path comprising, in combination, anoperating member arranged alongside the path of the movable membermovable in direct-ion of the same between inoperati e and operativeposition; stopping means operuied by operating member when the samereaches sa' :perative position thereof and i erated stopping saiddrivroving the movable member ied thereof; means for speed of movementof said riven by said driving mechin means mounted on said movl movablebetween an operative said means for slowing down posit on out ofengagement ior slow ng down the speed of '1 re :nemoe and notches Jararranged so as to be interlocking member shortly a member reaches thepreder point of path, said engagement perinto-Locking means to move fromto operative position so as to slow i of said movable member and"oveznent of said operating from in eiatiie into operative positionlatter position it operates said stopping 1011 acme.

means stopp tb driving mechanism for moving the movable i be" and thusalso stopping the slowed down movement thereof.

3. In an arrangement including a .member movable alonga'predeterminedpath and a drivingmechanism for moving said movable memher along saidpredetermined path, means for terminatingmovement-of said movable memberat a predetermined point of said path comprising, in combination, afirst operating member arranged alongside the path of the movable membermovable in direction of the same between inoperative and operativeposition; stopping means operated by said first operating member whenthe same reaches said operative position iereof and in turn, when thusoperated, stopping said driving mechanism for moving the movable memberalong the predetermined path thereof; second operative member arrangedalon side the path of the movable member movabl in direction of the samebetween inoperative and operative position; means forslowing down thespeed of movement of said movable member driven by said drivingmechanism; interlocking m ans mounted on said movable member an i .blebetween an operative position act said means for slowing down and aninop rative position out of engagement with said l'or slowing down thespeedof movement of said movablemember: first notches in said firstoperal member arranged so as to be engaged by said interlocking membershortly before said movable member reaches the predetermined oint ofpath, said engagement permitting a1 interlocking means to move frominoperat ve into operative position so as to slow down n meat of saidmovable member from inopera operative position in which latter positierates saidstopping means stoppi' in erative memberarrangedsubstantially in a ment, respectively, with said first note firstoperative memberand being enga interlocking means so that mo ber andsaid operating members connectv to by said interlocking means carry outa motion as a unit.

4. in an arrangement inciu." movable along a predetermined n ingmechanism for loving said 1; o ber along said predetermined path, mealmin-ating movement of said movable a predetermined point of said path oin combination, a first operating r ranged alongside the path of themovab ber movablein direction of the same b operative and operativeposition; sto operated bysaid first operating r; the same reaches saidoperative and iii-return, when thus operated, sto

driving mechanism 101' moving the "101 211,." her along the rprcdetemined p 5 1e second operative member arrang path of the movable membermova tion of the same between inopera erative position; means for slospeed of movement of said movable driven by said driving meohanisinterlo means mounted on said movable nier movable between an open saidmeans for slowing down and an i opw postion out oi engagement with saidslowing down the speed of move movable member; first notches in 5'..-erative member arranged so as to be or one of said lugs of saidinterlocking shortly before said movable member reaches thepredetermined point of said path; and second notches in said secondoperative member arranged, respectively, substantially in alignment withsaid first notches in said first operative member and being engaged bythe other of said lugs of said interlocking means so that said movablemember and said operative members connected thereto by said interlockingmeans carry out a motion as a unit, said engagement permi ting saidinterlocking means to move from inoperative into operative position soas to slow down movement of said movable member and re" sulting also inmovement of said first open ive member from inoperative into operativeposition in which latter position it operates said stopping meansstopping the driving mechanism for n1oving the movable member and thusalso stopping the slowed down movement thereof.

5. In an arrangement including member movable along a predetermined pathand a driving mechanism for moving said movable member along saidpredetermined path; means for terminating movement of said movablemember at a predetermined point of said path comprising, in combination,a rotatable shaft supporting said movable member; a first operatingmember arranged alongside said rotatable shaft and the path of themovable member movable in direction of the same between inoperative andopera'tive position; stopping means operated by said first operatingmember when the reaches said operative position thereof in turn, whenthus operated, stopping said driving mechanism for moving the movablemember along the predetermined path thereof; a second operative memberarran ed alongside the path of the movable member movable in directionof the same between inoperative and operative position; means forslowing down the speed of move ment of said movable member driven bydriving mechanism, said slowing down means includi a pair of contactsand an element actuating v d contacts so as to close and open the saidelement being arranged on said rotata re shaft; interlocking meansmounted on said rotatable shaft and connected to said movable member,said interlocking means having two lugs, said interlocking means beingmovable between an operative position actuating said means for slowingdown and an inoperative position out of engagement with said means forslowing down the speed of movement of said movable member; first notchesin. said first operative member arranged so as to be engaged by one ofsaid lugs of said interlocking member shortly before movable memberreaches the predetermined point of said path; and second notches in saidsecond operative member arranged, respectively, sub stantially inalignment with said first notches in said first operative member andbeing engaged by the other of said lugs of said interlocking means sothat said movable member and operative members connected thereto byinterlocking means carry out a motion as a unit, said engagementpermitting said interlocking means to move from inoperative intooperative position so as to slow down movement of said movable memberand resulting also in movement of said first operative member intooperative position in which latter position it operates said stoppingmeans stopping the driving mechanism for moving the movable member andthus stopping the slowed down movement thereof.

6. In an arrangement including a member movable along a predeterminedpath and a driving mechanism for moving said movable member along saidpredetermined path, means for terminating movement of said movablemember at a predetermined point of said path comprising, in combination,a rotatable shaft supporting said movable member; a first operatingmember arranged alongside said rotatable shaft and the path of themovable member movable in direction of the same between inoperative andoperative position; stopping means operated by said first operatingmember when the same reaches said operative position thereof and inturn, when thus operated, stopping said driving mechanism for moving themovable member along the predetermined path thereof; a second operativemember arranged alongside the path of the movable memb er movable indirection of the same between inoperative and operative position; meansfor slowing down the speed of movement of said movable member driven bysaid driving mechanism, said slowing down means including a pair ofcontacts and an element actuating said contacts so as to close and openthe same, said element being arranged on said rotatable shaft;interlocking means mounted on said rotatable shaft and connected to saidmovable member, said interlocking means having two lugs, saidinterlocking means being movable between an operative position actuatingsaid means for slowing down and an inoperative position out ofengagement with said means for slowing down the speed of movement ofsaid movable member; first notches in said first operative memberarranged so as to be engaged by one of said lugs of said interlockingmember shortly before said movable member reaches the predeterminedpoint of said path; second notches in said second operative memberarranged, respectively, substantially in alignment with said firstnotches in said first operative member and being engaged by the other ofsaid lugs of said interlocking means so that said movable member andsaid operative members connected thereto by said interlocking meanscarry out a motion as a unit, said engagement permitting saidinterlocking means to move from inoperative into operative position soas to slow down movement of said movable member and resulting also inmovement of said first operative member into operative position in whichlatter position it operates said stopping means stopping the drivingmechanism for moving the movable member and thus stopping the sloweddown movement thereof; and a device arranged on said rotatable shaft foradjusting the sensitivity of an apparatus connected to the arrangement.

'7. In an arrangement including a member movable along a predeterminedpath and a driving mechanism for moving said movable member along saidpredetermined path, means for termi hating movement of said movablemember at a predetermined point of said path comprising, in combination,a rotatable shaft supporting said movable member; a first operatingmember an ranged alongside said rotatable shaft and the path of themovable member movable in direction of the same between inoperative andoperative position; stopping means operated by said first operatingmember when the same reaches said operative position thereof and inturn, when thus operated, stopping said driving mechanism for moving themovable member along the predetermined path thereof; a second operativemember arranged alongside the path of the movable member movable indirection of the same between inoperative and operative position; meansfor slov in; down the of movement of said movable member driven by saiddriving mechanism, said slowing down means including a pair of contactsand an element actuating said contacts so as to close and open the same,said element being arranged on said rotatable shaft; interlocking meansmounted on said rotatable shaft and connected to said movable member,said interlocking means having two lugs, said interlocking means beingmovable between an operative position actuating said means for slowingdown and an inoperative position out of engagement with said means forslowing down the speed of movement of said movable member; first notchesin said first operative member arranged so as to be engaged by one ofsaid lugs of said interlocking member shortly before said movable memberreaches the predetermined point of said path; second notches in saidsecond operative member arranged respectively, substantially inalignment with said first notches in said first operative member andbeing engaged by the other of said lugs of said interlocking means sothat said movable member and said operative members connected thereto bysaid interlocking means carry out a motion as a unit, said engagementpermitting said interlocking means to move from inoperative intooperative position so as to slow down movement of said movable memberand resulting also in movement 4 of said first operative member intooperative posi tion in which latter position it operates said stoppingmeans stopping the driving mechanism for moving the movable member andthus stopping the slowed down movement thereof; and a device arranged onsaid rotatable shaft for adjusting the sensitivity of an apparatusconnected to the arrangement, said sensitivity adjusting deviceincluding a contact arm arranged on said rotatable shaft and a pluralityof stationary contacts corresponding to different sensitivities of theapparatus.

8. In an arrangement including a member movable along a predeterminedpath and a driving mechanism for moving said movable member along saidpredetermined path, means for terminating movement of said movablemember at a predetermined point of said path comprising, in combination,an operating member arranged alongside the path of the movable membermovable in direction or" the same between inoperative and operativeposition; stopping means including electrical contacts operated by saidopcrating member when the same reaches said operative position thereofand in turn, when thus operated, stopping said driving mechanism formoving the movable member along the predetermined path thereof; meansfor slowing down the speed of movement or" said movable member driven bysaid driving mechanism; first actuating means mounted on said movablemember and movabie between an operative position actuating said meansfor slowing down and an inoperative position out of engagement with saidmeans for slowing down the speed of movement of said movable member; andsecond actuating means on said operating member arranged so as to beengaged by said first actuating means shortly before said movable memberreaches the predetermined point of said path, said engagement permittingsaid first actuating means to move from inoperative into operativeposition so as to slow down movement of said movable member andresulting also in movement of said operating member from inoperativeinto operative position in which latter position it operates saidstopping means stopping the driving mechanism for moving the movablemember and thus also stopping the slowed down movement thereof.

9. In an arrangement including a member movable along a predeterminedpath and a driving mechanism for moving said movable member along saidpredetermined path, means for terminating movement of said movablemember at a predetermined point of said path comprising, in combination,an operating member arranged alongside the path of the movable membermovable in direction of the same between inoperative and one 'ativeposition; stopping means including electrical contacts operated by saidoperating er when the same reaches said operative on thereof and inturn, when thus operated mg driving mechanism for moving the movablemember along the predetermined path thereof; means for slowing down thespeed of movement of said movable member driven by said drivingmechanism; interlocking means mounted on said movable member and movablebetween an operative position actuating said means for slowing down andan inoperative position out of engagement with said means for slow ngdown the speed of movement of said movmember; and notches in saidoperative mem- Jer arranged so as to be engaged by said interlocningmember shortly before said movable member reaches the predeterminedpoint of said path, sa d enr'ageinent permitting said interlocking tomove from inoperative into operative porn on so as to slow down movementor said movable ember and resulting also in movement i said operatingmember from inoperative into opertive position in which latter positionit operates said stopping means stopping the driving mechanism formoving the movable member and thus also stopping the slowed downmovement thereof.

10. In an arrangement including a member movable along a predeterminedpath and a driving mechanism for moving said movable member along saidpredetermined path means for terminating movement of said movable memberat a predetermined point of said path comprising, in combination, afirst operating member arranged alongside the path, of the movablemember movable in direction of the same between inoperative andoperative position; stopping means including electrical contactsoperated by said first operating member when the same reaches saidoperative position thereof and in turn, when thus operated, stoppingsaid driving mechanism for moving the movable member along thepredetermined path thereof; a second operative member arranged alongsidethe path of the movable member movable in direction of the same betweeninoperative and operative position; means for slowing down the speed ofmovement of said movable member driven by said driving mechanism;interlocking means mounted on said movable memher and movable between anoperative position actuating said means for slowing down and aninoperative position out of engagement with said means for slowing downthe speed of movement of said movable member; first notches in saidfirst operative member arranged so as to be engaged by said interlockingmember shortly before said movable member reaches the predeterminedpoint or" said path, said engagement permitting said interlocking meansto move from inoperative into operative position so as to slow downmovement of said movable member from inoperative into operative positionin which latter position it operates said stopping means stopping thedriving mechanism for moving the movable member and thus also stoppingthe slowed down movement thereof; and second notches in said secondoperative member arranged substantially in alignment, respectively, withsaid first notches in said first operative member and being engaged byinterlocking means so that said movable member and said operatingmembers connected thereto by said interlocking means carry out a motionas a unit.

11. In an arrangement including a member movable along a predeterminedpath and a driving mechanism for moving said movable member along saidpredetermined path, means for terminating movement of said movablemember at a predetermined point of said path comprising, in combination,a first operating member arranged alongside the path of the movablemember movable in direction of the same between inoperative andoperative position; stopping means including electrical contactsoperated by said first operating member when the same reaches saidoperative position thereof and in turn, when thus operated, stoppingsaid driving mechanism for moving the movable member along thepredetermined path thereof; a second operative member arranged alongsidethe path of the movable member movable in direction of the same etweeninoperative and operative position;

means for slowing down the speed of movement of said movable memberdriven by said driving mechanism; interlocking means mounted on saidmovable member and having two lugs, said interlocking means beingmovable between an operative position actuating said means for slowingdown and an inoperative position out of engagement with said means forslowing down the speed of movement of said movable member; first notchesin said first operative member arranged so as to be engaged by one ofsaid lugs of said interlocking member shortly before said movable memberreaches the predetermined point of said path; and second notches in saidsecond operative member arranged, respectively, substantially inalignment with said first notches in said first operative member andbeing engaged by the other of lugs of said interlocking means so thatsaid movable member and said operative members connected thereto by saidinterlocking carry out a motion as a unit, said engagement permittingsaid interlocking means to move from inoperative into operative positionso as to slov, down movement of said movable member and resulting alsoin movement of said first operative member from inoperative intooperative position in which latter position it operates said stoppingmeans stopping the driving mechanism for moving the movable member andthus also stopping the slowed down movement thereof.

12. in an arrangement including a member movable along a predeterminedpath and a driving mechanism for moving said movable member along saidpredetermined path, means for terminating movement of said movablemember at a predetermined point of said path comprising, in combination,a rotatable shaft supporting said movable member; a first operatingmember arranged alongside said rotatable shaft and the path of themovable member movable in direction of the same between inoperative andoperative position; stopping means including electrical contactsoperated by said first operating member when the same reaches saidoperative position thereof and in turn, when thus operated, stoppingsaid driving mechanism for moving the movable member along thepredetermined path thereof; a second operative member arranged alongsidethe path of the movable member movable in direction of the same betweeninoperative and operative position; means for slowing down the speed ofmovement of said movable member driven by said driving mechanism, saidslowing down means including a pair of contacts and an element actuatingsaid contacts so as to close and open the same, said element beingarranged on said rotatable shaft; interlocking means mounted on saidrotatable shaft and connected to said movable member, said interlockingmeans having two lugs, said interlocking means being movable between anoperative position actuating said means for slowing down and aninoperative position out of engagement with said means for slowing downthe speed of movement of said movable member; first notches in saidfirst operative member arranged so as to be engaged by one of said lugsof said interlocking member shortly before said movable member reachesthe predetermined point of said path; and second notches in said secondoperative member arranged, respectively, substantially in alignment withsaid first notches in said first operative member and being engaged bythe other of said lugs of said interlocking means so that said movablemember and said operative members connected thereto by said interlockingmeans carry out a motion as a unit, said engagement permitting saidinterlocking means to move from inoperative into operative position soas to slow down movement of said movable member and resulting also inmovement of said first operative member into operative position in whichlatter position it operates said stopping means stopping the drivingmechanism for moving the movable member and thus stopping the sloweddown movement thereof.

13. In an arrangement including a member movable along a predeterminedpath and a driving mechanism for moving said movable member along saidpredetermined path, means for terminating movement of said movablemember at a predetermined point of said path comprising, in combination,a rotatable shaft supporting said movable member; a first operatingmember arranged alongside said rotatable shaft and the path of themovable member movable in direction of the same between inoperative andoperative position; stopping means including electrical contactsoperated by said first operating member when the same reaches saidoperative position thereof and in turn, when thus operated, stoppingsaid driving mechanism for moving the movable member along thepredetermined path thereof; a second operative member arranged alongsidethe path of the movable member movable in direction of the same betweeninoperative and operative position; means for slowing down the speed ofmovement of said movable member driven by said driving mechanism, saidslowing down means including a pair of contacts and an element actuatingsaid contacts so as to close and open the same, said element beingarranged on said rotatable shaft; interlocking means mounted on saidrotatable shaft and connected to said movable member, said interlockingmeans having two lugs, said interlocking means being movable between anoperative position actuating said means for slowing down and aninoperative position out of engagement with said means for slowing downthe speed of movement of said movable member; first notches in saidfirst operative member arranged so as to be engaged by one of said lugsof said interlocking member shortly before said movable member reachesthe predetermined point of said path; second notches in said secondoperative member arranged, respectively, substantially in alignment withsaid first notches in said first operative member and being engaged bythe other of said lugs 01 said interlocking means so that said movablemember and said operative members connected thereto by said interlockingmeans carry out a motion as a unit, said engagement permitting saidinterlocking means to move from inoperative into operative position soas to slow down movement of said movable member and resulting also inmovement of said first operative member into opera tive position inwhich latter position it operates said stopping means stopping thedriving mechanism for moving the movable member and thus stopping theslowed down movement thereof; and a device rranged on said rotatableshaft for adjusting the sensitivity of an apparatus connected to thearrangement.

14. In an arrangement including a member movable along a predeterminedpath and a driving mechanism for moving said movable member along saidpredetermined path, m ans for terminating movement of said movablemember at a predetermined point of said path comprising, in combination,a rotatable shaft supporting said movable member; a first operating mmber arranged alongside said rotatable shaft and the path of the movablemember movable in dire tion of the same between inoperative operativeposition; stopping means including electrical contacts operated by saidfirst operating member when the same reaches said operative positionthereof and in turn, when thus operated, stopping said driving mechanismfor moving the movable member along the predetermined path thereof; asecond operative member arranged alongside the path of the movablemember movable in direction of the same between inoperative and opera'tive position; means for slowing down speed of movement of saidmovable member driven by said driving mechanism, said slowing down meansincluding a pair of contacts and an element actuating said contacts soas to close and open the same, said element being arranged on saidrotatable shaft; interlocking means mounted on rotatable shaft andconnected to said movable member, saic interlocking means having twolugs, said interlocking means being movable between an operativeposition actuating said means for slowing down and an inoperativeposition out of engagement with said means ior slowing down the speed ofmovement of said movable member; first notches in said first operativemember arranged so as to be engaged by one of said lugs of saidint-flocking member shortly before said movable member reaches thepredetermined p int of said path; second notches in said secondoperative member arranged, respectively, substantially in alignment withsaid first notches in first operative member and being engaged by theother of said lugs of said interlocking means so that said movablemember and said operative members connected thereto by said interlockingmeans carry out a motion as a unit, said engagement permitting saidinterlocking means to move from inoperative into operative position soas to slow down movement of said movable member and resulting also inmovement of said first operative member into operative position in whichlatter position it operates said stopping means stopping the vingmechanism for moving the movable member and thus stopping the sloweddown movement thereof; and a device arranged on said rotatable shaft foradjusting the sensitivity of an apparatus connected to the arrangement,said sensitivity adjusting device including a contact arm arranged onsaid rotatable shaft and a plurality of stationary contactscorresponding to difierent sensitivities of the apparatus.

References Cited in the file of this patent UNITED STATES PATENTS

